LEDGARD HENRY. (1982). ELEMENTRY BASIC BY SOLVING THE MYSTERIES OF SHERLOCK HOMES. COLLINS.
Chicago-viite (17. p.)LEDGARD HENRY. ELEMENTRY BASIC BY SOLVING THE MYSTERIES OF SHERLOCK HOMES. GREAT BRITAIN: COLLINS, 1982.
MLA-viite (9. p.)LEDGARD HENRY. ELEMENTRY BASIC BY SOLVING THE MYSTERIES OF SHERLOCK HOMES. COLLINS, 1982.
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